Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08feb46b1a2ce27…

MALICIOUS

PDF

104.9 KB Created: 2021-07-26 11:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 830133de6c092832933398ae2c89bcc2 SHA-1: 42366d4454ff6954506a4f167853e04126cfc3e0 SHA-256: b08feb46b1a2ce2783b02c36230f05f6cf40c9966ebe97fa0eb732ed1df63d78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains flagged as disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The PDF structure itself, with its link farm characteristics, suggests an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://polyalpan.hu/_user/file/pibosokep.pdf In PDF document text
    • http://garmagostaran.com/Upload/file/58936958605.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1gvjh4pk9pnfohfcjbl3sbd2bl/nesuzamulemajejino.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/50265703838.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f534faa786---52319707612.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/n4he7cne5uqdf26f09veh94bjt/nozajurobajuvenepapune.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcfbda521---muvumipelofud.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/woninemuxelekevut.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/rtttshm7oh1ee0j8943r08hlm1/vetili.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9761cc12f---39786944023.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088792073e57---piwudonodazivosizemorom.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/85ac34e480d155ece78a84f9d89a2b9d/fadaturuvafipamivo.pdfIn PDF document text
    • http://caramelitos.sk/files/komasurusojaruragoximemo.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/bubakakoxolexusirat.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/66368654862.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f051c44f7---93362880287.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/25374682728.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/24/file/timeduje.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/surorofilomomuxilogitoka.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/perojalazanufa.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf3677b93---senipi.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/46206380659.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/2839364047.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b83fc5bf3---pudekoxabujaxozolemexotiv.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ffee647ef---17162740485.pdfIn PDF document text
    • http://turnyras.lt/Files/file/53040973238.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0e7cd6b9f52f13c09f9cfe4095fad621/24246802433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bsc+physics+1st+semester+question+papers+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001323d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323D 11436 bytes
SHA-256: ff2179fccb459228dcac12f9b37eae6194bdc9b7122313677c5858b0f16b0c09
font_01_sfnt_off00014d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D04 17484 bytes
SHA-256: a83cd159782bcb491c89b9988874020a54dc8be43666c67576d16b0e1f071dd0
font_02_sfnt_off00017aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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